When a photoelectric sensor outputs no signal, you can troubleshoot quickly by following these steps:
1️⃣ First, check wiring or configuration issues:
▪️Confirm that both the emitter and receiver of through-beam sensors are correctly powered and that positive and negative connections are correct.
▪️Check if the diffuse reflective sensor's probe and retroreflective plate are used together, ensuring stable power supply.
2️⃣ Check object position and beam alignment:
▪️Ensure the object to be detected is within the sensor's detection area, i.e., within the range where the sensor can detect.
▪️Check if the emitter and receiver axes of through-beam sensors are aligned, and if the probe and reflector axes of retroreflective sensors are aligned.
3️⃣ Check if the object meets the standards:
▪️Ensure the object isn't smaller than the minimum detectable size, avoiding difficulties in detecting transparent objects with through-beam or reflective sensors.
▪️Reflective sensors have color requirements for detected objects; the darker the color, the shorter the detection distance.
4️⃣ Check environmental interference:
▪️Check if the light intensity exceeds the rated range; if there's dust in the environment, regular cleaning of the sensor probe surface is required.
▪️Check for closely installed sensors causing mutual interference, or if there are high-power devices nearby causing electrical interference.
5️⃣ Check power supply voltage:
▪️Ensure the sensor's operating voltage meets the requirements; incorrect input voltage can also prevent the sensor from working correctly.
6️⃣ Check external light source interference:
▪️Some photoelectric sensors are sensitive to strong light or infrared radiation; if there's a strong light source nearby, use a light shield.
7️⃣ Check sensitivity settings:
▪️Check if the sensor's sensitivity setting is appropriate; settings too high or too low can lead to false triggers or no signal output.
8️⃣ Use professional tools for detection:
▪️Use a voltage detector to check if the voltage is stable, determining if the input voltage meets requirements.
▪️Use a signal generator to produce signals at different frequencies and observe the sensor's response to judge if the sensor is functioning correctly.
If, after checking all these steps, there's still no signal output, it's suggested to return the sensor to the manufacturer for testing and judgment.
